Air feed and vent for closed-top gas stoves



Feb. 19, 1929. 1,702,297

' J. B. GARDNER AIR FEED AND VENT FOR CLOSED TOP GAS STQVBS Original Filed Hay 11. 1925 INVEN TOR.

supply of fresh air at the burners.

Patented Feb. 19, 1929 UNITED STATES PATE NT OFFICE.

JOSEPH B. GARDNER, OF OAKLAND, CALIFORNIA, ASSIGNOR TO HAMMER-BRA! COIL YANY, OF OAKLAND, CALIFORNIA, A CORPORATION 'OF CALIFORNIA.

AIR FEED AND VENT FOR CLOSED-TOP GAS STOVEB.

Original application filed May 11, 1925, Serial N'o. 29,365. Divided and this applicationflled February 8,

1926. Serial No. 85,668.

The invention relates to means incorporated with a burner chamber of a closed top stove, for insuring an adequate supply of fresh air to all of the burners in the chamber. This application forms a division of my original application Serial No. 29,365, Which was filed in the Patent Office on May 11, 19:25, the present application relating more particularly to the embodiment of the invention illustrated in Figures 3 and 4 of said original application,

Most gas stoves, particularly ranges, are equipped with front and rear gas burners which are positioned in What may be termed a burner chamber. \Vhere a grate has been superposedover the burners to provide a cooking top, no difliculty has. been experienced in the matter of an adequate external However, when the burner chamber has been covered with a closed or solid top, it has been found that the rear burners receive less fresh air for combustion than do the front burners, since the burner compartment is usually open only at the front and such fresh air that flows by the front burners escapes into the flue vent at the rear of the chamber, without the desired contact withthe rear burners. Various attempts have been made to remedy ti so diliiculties, but in general the results obtained thereby have not been satisfactory. The reason I believe lies in the fact that too little attention was given to the effect of the location of the burnt gas discharge opening or openings upon the flow of the fresh air in the chamber. FllltliGl'lIlOIE, the structures involved in such attempts in most instances requireforming the bottom and top plate in such manner as to necessitate the use of a special drip-pan and render the complete removal of such top plate impractical. In accordance with the foregoing it is my object to insure adequate supply of fresh air to all the burners in the chamber Without entailing the objectional features referred to. v

The invention possesses other objects and features of advantage, some of WlllClnWltll the foregoing, will be set forth in the followinp description of the preferred forms of my invention which are illustrated ilithedraw ings accompanying and forming partof the specification. It is to be unclerfstood thatI donot liniit myself to the showing made by the said drawings and description, as I may adopt variations of the preferred forms with in, the scope of my invention as set forth in the claims. i

Referring to said drawings:

Figure 1 is a perspectiveviewof the cook ing top portion of a stove embodying my invention. H

Figure 2 is a vertical section ofthe stove portion, illustratedin Figure 1 and taken on theline 22 thereof.

Figure is a perspective view similar to Figure 1, illustrating another embodiment of the invention. i

Figure 4 is a vertical section taken on the line &4 of Figure 3. y f l 1 1 Briefly expressed, my invention comprises, providing a fresh air inlet at the rear as well as at the front of the chamber, and further providing a passage directly into the central portion of the chamber from either such rear inlet or the vent for the combustion products so that upon the dischar e of thecon'ibustion products into the vent, t o air entering from the rear inlet willbecaused to movetoward the center of the chamber and. conse uently against the. rear burners,in substantia ly the same manner as the airentering from the front inlet is caused to he directedagainst the'irontburners. y

b In the drawingaas previously noted, there arcillustrated two embodimentsoffthe invention. One embodiment utilizes a passage while the top is closed by the cooking platel t here shown as a section of the top member .15

which also overlies and forms the, cooking plate for the fire-box .lfivat one side of the chamber. The cooking plate or section 14 ion is made reinovablefromrthe top member 15 so that if desiredagrate (not shown) maybe substituted therefor. Openings 17 are provided in the plate 1a and are normally covered by lids 18. The compartment 7 is formed rather shallow in order that a maximum space may be available thereunder for other uses. Arranged in the compartment are front and rear top-gas-lnirners 19 and 2}. which are preferably aligned with the open ings 17 of the cooking plate.

A proper gas mixture for the burners is arranged to be supplied thereto through pipes 22 provided with air mixers 23 and connected to a gas manifold 24 at the front of the stove. In most types of closed top stoves at least part of the fresh air for coi'npleting combustion at the lnirners is arranged to enter directly into the compartment through the opening or space extending across the bottom portion of the front plate 26 thereof and the products of combustion are arranged to discharge directly into a vent located at the rear of the compartment. Such location of the vent with respect to the fresh air inlet, while affording a proper supply of fresh air to the front-burners, causes the air vitiated at the front burners to be drawn over the rear burners and thus hinder complete combustion thereat. It will be understood since other stove units, such as the fire-box and ovens 27 and 28 here shown, are usually positioned at one or both of the sides of the compartment, additional fresh air for the rear burners is best brought from the rear of the chain ber. It will be clear, however, that any attempt to provide fresh air inlet openings at the rear of the chamber with the vent like wise located, will cause the fresh air from said inlet to be drawn into the vent without materially associating with the rear burners. In accordance with the present invention, 1

so arrange the intake of the vent that the use of fresh air inlet openings at the rear of he chamber is made fully effective to furnish an adequate supply of fresh air at the rear lnuners. Accordingly, one or more openings 29 are provided in the rear wall. 15?. through which fresh air is arrainred to be drawn directly into the chamber from without the stove. Registering with a vent opening 31, preferably provided in the wall 12, are internal and external flue portions 32 and 33 respectively. The internal flue portion 32 comprises branches 34; which extend to and along the opposite side walls 8 and 9 of the chamber and have their inlet openings 36 located opposite the space between the lidjacent front and rear burners. The openings 36 are disposed in a plane above that of the fresh air inlets at both the front and. rear of the chamber so that the combustion prod ucts will move to the flue by convection. It

will thus be noted that communication of.

the fine with the chamber is effected. only through the medium of the flue openings 36. It will now be clear that a fresh air supply is provided for the front and rear burners independently, and that by reason of the location of the fine openings in the chamber, the vi tiated air from a front burner will not associate with a rear burner.

The flue branches are positioned well toward the top of the chamber 7 so that obstruction of the chamber avoided and a fullsized drip pan of maximum size may be placed therein. Furthermore, the branches 34: are preferably formed separately of the top member 15 to thereby permit the removal of the top section 142.

Another arrangement for preventing the vitiated air from the front burners from circulating over the rear burners, and furnishing; the latter with an il'idependent supply of fresh air is shown in Figures 3 and 4-7. In this arrangement, fresh air for the rear burners is drawn into the chamber through inlet openings ll formed in the rear wall 12 of the chamber and positioned adjacent the side walls 8 and 9 thereof. The fresh air from such openings is caused to iiow in streams inwardly and adjacent the sides of the chamher, and then caused to pass over the rear burners before its discharge from the chain her is permitted. As here shown, passages 42 through which the incon'iing air is directed toward the central portion of the chamber are defined between the bottom 13 and a plate 43, and the side walls of the chamber and partitions 4st. The plate 43 is positioned against the rear wall of the chamber and separates the intake openings from the vent opening 46 of the fine, it being noted that the vent opening is positioned above the plate, while the inlet openings and the passages 4'2 lie below the plate. Since the vent opening M5 is located opposite the space between the rear burners, the vitiated air from the front burners, in flowing to saio opening, will, for the most part, pass through said space between the burners. Furthern'iore, the air from the passages 2, while and after passing; over the rear burners, will not only supply the necessary aid to combustion at the latter, but will force the stream of vitiated air from the front burners to still greater confinement in the space between the rear burners. The bottom edges of the partitions as are preferably spaced from the bottom 13 of the chamber in order that a drip-pan 30 may extend there under.

I claim:

1. In a stove, a closed topgas-burner cham ber having fresh air inlets adjacent the bot-- tom of different sides thereof and a vent adjacent the top of one of said sides, burners within the chamber adjacent said sides, and

a horizontal baiile plate extending across said chamber positioned adjacent said last side and in a plane below the top of said burners and separating the vent and adjacent inlet whereby the fresh airdrawn into the chamher through the latter may be caused to contact intimately with the adjacent burner before it may discharge through the vent.

2. In a stove, a closed top-gas-burner chamber having fresh air inlets adjacent the bottom and opposite side portions thereof, burners in said chamber adjacent said inlets having jet orifices, a fine opening being located in said chamber adjacent the to and one of said side port-ions, a substantiall y horizontal bafile plate positioned in a plane below the jet orifices of said burners extending across said chamber at said last side portion and separating said flue opening and the adjacent in let, whereby the fresh air will be prevented from discharging into said flue opening be fore entering into intimate contact with the adjacent burner.

3. In a stove, a closed top-gas-burner chamber having fresh air inlets adjacent the bottom of the front and rear thereof, a flue open ing at the rear thereof located adjacent the top, a substantially horizontal plate separating the rear portion of the chamber into superposed upper and lower compartments extending the full Width ofjthe chamber, said flue opening and adjacent inlet respectively communicating with the upper and lower compartments, a burner in said chamber adjacent the front thereof, and a burner in the chamber lyin in a plane above said plate and positione to intercept the fresh air from the rear inlet before it passes out of the chamber through the flue opening.

4. In a stove, a closed top-gas'burner chamher having fresh air inlets adjacent the bottom of the front and rear sides thereof, a substantially horizontal bafie plate positioned in the rear of said chamber above the inlets thereat and in spaced relation from the top of the chamber, a rent at the rear of the chamber located mediately of the chamber sides and above the plate, said rear inlets be ing located adjacent the sides of the chamber, burners in the front of the chamber, burners in the rear of the chamber lyin at least partially above said plate, and de ecting means on the bottom of said plate arranged to direct the flow of air from each of said rear inlets toward a different rear burner.

In testimony whereof, I have hereunto set my hand at Oakland, California, this 29th day of January, 1926.

JOSEPH B. GARDNER. 

